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"/> • if the power light is blinking..."

Since you wanted to know about the problem on your Comcast which is its green light is repeating repeatedly then I would explain to you the meaning of each blink and what main problem it is causing.

• If the power light is blinking, your Digital Adapter is not authorized. You can authorize your Digital Adapter by calling service hotline at 1.800.888.1300.
• Long continuous blink: The Digital Adapter is in a “hunt” mode. This means that it is not ready to be authorized.
• If you tried to authorize your Digital Adapter during the “hunt” mode, the Digital Adapter will not be authorized. Wait until the Digital Adapter shows two short blinks and then authorizing again.
• Three short blinks: The Digital Adapter is updating itself. Wait until the Digital Adapter shows two short blinks and then authorizing again.
• Two short blinks: This means that your Digital Adapter is ready to be authorized.
Once your Digital Adapter is authorized, a solid power light will indicate normal operation mode.

"If you are getting a flashing green light on the cable box..."

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If you are getting a flashing green light on the cable box, then the problem is with your TV and not with the cable box. Follow the cables from your box to your TV, and make sure the television is using the right input source.

Check the connection, if your cable box is plugged into your first HDMI port, then your TV must be set to "HDMI 1."

then try to reboot the device and check if still getting the same thing.

"If you are using the dta (digital transport adapter..."

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If you are using the DTA (Digital transport adapter) it is more than likely what is called a rate code. You can call and ask them to check these but they will probably want to send a technician. Only other thing it could be is a signal issue.

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